Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc1c8996769d7f2…

MALICIOUS

PDF

93.9 KB Created: 2021-07-24 12:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba815ebac18d1ea0417714ff7900b8f8 SHA-1: 01f4938725d07aba0aecd7de3c5834dfedd9ee1e SHA-256: 7dc1c8996769d7f215398f25cab8a25c6ee117022c70828ea6484e891d415b37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://samuiluxurytravel.com/Uploads/file/49751835187.pdf
    • http://alarcon-v.com/editor_upload_image/file/zenerorof.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c0603c0395bc1b512842846a8046e6e2/digipipimotisog.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fef27ecc---26230343373.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8defd44c9---81422758394.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/14b0096e3104c3fceedf065204023458/13902340571.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6c0af009---4450941599.pdf
    • http://castrolmintabolt.hu/images/upload/file/mabawew.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/21259650791.pdf
    • http://multi-accueil.fr/ressource/site-image/files/37761883717.pdf
    • http://olgapolyakova.com/files/files/31888185861.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926eb608b78---27085225661.pdf
    • https://tsegypt.com/file/gejipa.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c326a3bdf6---nolonunizojo.pdf
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/rapekaduvuloxasekupi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16132de00c---42335218991.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7854fb2271c9a333926386e43acd89d/rejazidesijutobumuvuliw.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5746fccd1a072b221de7199f628d9a7b/vedexosanogubizikesij.pdf
    • http://auapp.ch/userfiles/files/jewoxujoxazaxaxamifo.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094209e0ead4---modoviragefevokawixibek.pdf
    • http://zovsh.com/Uploadfiles/files/88962924999.pdf
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42641869671.pdf
    • http://shriadinathbank.com/uploads/15816634623.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c2d89b88c0ceff1412c3198353be58d6/vokotatojiwupefavuwineru.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=formula+de+la+tercera+ley+de+newton+%28accion+y+reaccion%29
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000f391.bin
9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF391 16244 bytes
font_01_sfnt_off00010981.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
font_02_sfnt_off00012193.bin
aa975ee169fcb333dcfe78d3fa632ebc477034829b319cde490dd400c8696452
pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 17520 bytes
font_03_sfnt_off00014e62.bin
e0fb079021e66b123956e177dc3ab1b24cda81f685eb0afc4ef35f978c1ab9c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E62 10796 bytes